I have recently installed Windows 7 Ultimate, and I continue to have the following problem: Occasionally while using my computer, my sound will start to crack and warp. As it continues, the sound slows down and becomes very distorted. Once or twice, this has resulted in a system freeze and blue screen of death. I have installed the most recent nForce drivers for my chipset with integrated sound (ASUS A8N-SLI with the nForce 4 SLI chipset), the most recent graphics drivers (GeForce 6 series for my twin 6800s) and the most recent Realtek drivers. My computer is acting as a media center and is plugged in from DVI to HDMI on my 55" LG LCD and the audio is in through a standard 1/4" jack. I have experienced in in full screen VLC while watching HD video and while streaming video from the internet. Does anyone know what could be causing this slowdown and distortion?